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historicalmarkerproject/markers/HMUGW_inspiration-point_Yellowstone-National-Park-WY.html
A Youthful Glow
The Grand Canyon of the Yellowstone River was born thousands of years ago, but is till young in geologic time.
After Yellowstone's most recent icecap melted about 14,000 years ago, the Yellowstone River began excavating old r…
historicalmarkerproject/markers/HMUGV_the-grand-canyon-of-the-yellowstone_Yellowstone-National-Park-WY.html
The canyon varies from 800 to 1200 feet in depth and from 1500 to 4000 feet in width. Its length is about 24 miles. The upper 2½ miles is the most colorful section. Hot spring activity has continued through the ages altering the lava rock to …
historicalmarkerproject/markers/HMUGU_grand-view_Yellowstone-National-Park-WY.html
Deep and WideThe Grand Canyon of the Yellowstone River is?
· More than 1,000 feet deep in most places (305 m)· Up to 4,000 feet wide (1,219 m)· 20 miles long (32 km)· Carved from old rhyolitic lava flows· Ther…
historicalmarkerproject/markers/HMUGT_waterfall-makers_Yellowstone-National-Park-WY.html
Here the Yellowstone River plunges 308 feet over the Lower Falls. Hot springs have weakened the rock jut downstream, where you might see several geysers spouting into the river. As falling water pounds the thermally softened rock, it continues to …
historicalmarkerproject/markers/HMUGS_lookout-point_Yellowstone-National-Park-WY.html
Welcome to Lookout Point
Lookout Point is popular for its lofty view. The trail to the overlook is about 145 yards (133 m) long, and includes 13 steps.
A steep descent to Red Rock will take you to the North Rim's closest full view of Lower F…
historicalmarkerproject/markers/HMUGQ_brink-of-lower-falls_Yellowstone-National-Park-WY.html
Sculpting Lower Falls
Reaching the Brink of Lower Falls overlook requires hiking a steep trail that winds down the canyon wall?a wall of hardened rhyolite lava?a wall exposed by the Yel1owstone River while excavating the canyon.
Below Lower …
historicalmarkerproject/markers/HMUGP_brink-of-upper-falls_Yellowstone-National-Park-WY.html
Between a Rock and a Hard Place
From the Brink of Upper Falls viewpoint you can witness the power of the Yellowstone River as you watch millions of gallons (liters) of water plunging 109 feet (33 meters).
From the brink, notice the solid wal…
historicalmarkerproject/markers/HMUGA_upper-falls-of-the-yellowstone-river_Yellowstone-National-Park-WY.html
A waterfall is a clue that you are standing on a geologic crossroads.
A waterfall forms in a river channel where harder rocks meet softer rocks that erode more easily and quickly. Here, volcanic and hydrothermal activity have created the 109-fo…
historicalmarkerproject/markers/HMUG7_uncle-toms-point_Yellowstone-National-Park-WY.html
Welcome to Uncle Tom's Point
Uncle Tom's TrailFor a memorable descent into the canyon, follow Uncle Tom's Trail. From there, you can sense the power of Lower Falls as the Yellowstone River thunders over the brink, dropping 308 feet (93 m).
T…
historicalmarkerproject/markers/HMUG1_canyon-colors_Yellowstone-National-Park-WY.html
Mineral stains mark the sites of hot springs and steam vents in the canyon walls. For thousands of years,upwardly percolating fluids have altered the chemistry of the rocks, turning them yellow, red, white, and pink.
From the rim, the bright pa…